My dog eats bees

my pit bull eats bees a lot and I was wandering if that's what could of caused the blister in his mouth, and if there was any to get him to stop eating bees.

Here are some reasons why dogs are not good kept outside:
(He's probably bored and that's why he's eating the bees)

WHAT YOU SHOULD KNOW:

DOGS ARE PACK ANIMALS THAT THRIVE ON COMPANIONSHIP. Much like their wolf ancestors, dogs are very social. In fact, dogs are more social than humans and need to be part of human families. When you own a dog, you become the dog's pack and he wants to be with his pack. Forcing a dog to live outside with little or no human companionship is one of the most psychological damaging things a pet owner can do to a dog.

DOGS ARE ALSO DEN ANIMALS, meaning they like to have a safe, quiet, and secure place to sleep, rest, and hang out, such as your house. Your dog has a wonderful ability to learn and therefore to be housetrained. A dog who resides more in your house than in the yard is a much happier, content animal, because of the security of a den and your companionship.

BACKYARD DOGS HAVE MORE BEHAVIORAL PROBLEMS. Since all your dog's instincts are telling him it is not good to be left alone or isolated from his pack, your dog can become very stressed or anxious. A dog exhibits stress by digging, barking, howling or whining, chewing, escaping, and exhibiting hyperactivity. These problems can become so troublesome that your neighbors may complain about the barking, howling, property destruction, or your dog escaping.

BACKYARD DOGS ARE HARDER TO TRAIN. Considering a backyard dog does not develop a strong bond toward your family, he is harder to train than a dog allowed to be in the house with your family. This also makes him less responsive to commands.

BACKYARD DOGS MAKE LOUSY GUARD DOGS. As a dog becomes naturally protective of where he lives (his territory or turf), he will only defend the place he lives in. If he is never allowed in the house, then the house will not become a place to protect. Most people keep their valuables inside their houses, so why wouldn't you want your dog to protect the inside of your house? Unless allowed to live inside, your dog will not develop that sense of territory. He will not sound the alarm when someone tries to invade your house. It is not uncommon to hear stories of families being robbed while their backyard dog snoozed through the whole episode.

BACKYARD DOGS HAVE HIGHER RATES OF EUTHANASIA. Backyard dogs are more often given up than house dogs because they were never looked upon as family by their human pack. Sadly, that means they are easier to dispose of. Backyard dogs do not have the opportunity to become socialized to people and other dogs, and may become so fearful or even vicious that they may have to be euthanized.

You can...keep him inside...

Dogs aren't really meant to be left outside in the elements.

Yes to all of the above. I would do as Editor says and bring your dog in. Bees not a good thing for your dog to be around eating or being stung by.